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Histidine ball and stick model spinning. Histidine (symbol His or H) [2] is an essential amino acid that is used in the biosynthesis of proteins.It contains an α-amino group (which is in the protonated –NH 3 + form under biological conditions), a carboxylic acid group (which is in the deprotonated –COO − form under biological conditions), and an imidazole side chain (which is partially ...
In whole blood (g/cm 3) In plasma or serum (g/cm 3) Water: ... normal 1-5 × 10 −9: toxic 0.1-3 ... adult male, avg. (range) 5.2 ...
A typical characteristic of histidinemia is an increase in the blood histidine levels from normal levels (70–120 μM) to an elevated level (290–1420 μM). [3] Further testing includes: observing histidine as well as imidazolepyruvic acid metabolites in the urine. However, neonatal urine testing has been discontinued in most places, with the ...
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
The average concentration of 3-methylhistidine in human blood plasma has been detected and quantified at 2.85 micromolar (μM) with a range of 0.0–5.9 μM. [1] The average concentration of 3-methylhistidine in human cerebrospinal fluid (CSF) has been detected and quantified at 3.82 μM with a range of 1.39–6.25 μM. [1]
The standard definition of a reference range for a particular measurement is defined as the interval between which 95% of values of a reference population fall into, in such a way that 2.5% of the time a value will be less than the lower limit of this interval, and 2.5% of the time it will be larger than the upper limit of this interval, whatever the distribution of these values.
Concentrations above the reference range are found in paraproteinaemia, Hodgkin's lymphoma, leukaemia or any condition causing an increase in immunoglobulins. Total protein is also commonly elevated in dehydration and C677T gene mutation. Reference ranges for blood tests, with total plasma protein (shown in purple at right) with other constituents.
It is a dimer, and hydrolyzes both carnosine and anserine, preferring dipeptides that have a histidine monomer in the C-terminus position. [ 11 ] [ 12 ] Tissue carnosinase is often considered a "nonspecific dipeptidase", [ 13 ] [ 15 ] based in part on its ability to hydrolyze a range of dipeptide substrates , including those belonging to ...